Remove the stem from mushroom.
Whisk the egg on a plate, add some salt and pepper.
Dip each mushroom in the egg, both sides.
Place bread crumbs on the plate.
Dip mushroom in bread crumbs, both sides.
Heat the oil in the pan. Place the mushroom and cook on low-medium heat for 3 - 5 minutes. Flip and cook for another 3 - 5 minutes on the other side.
Cut into pieces.